DISTANCE-DEPENDENT RESTORATION FILTERING OF DUAL PHOTOPEAK WINDOW SCATTER COMPENSATED SPECT IMAGES

A non-iterative SPECT reconstruction method is presented which consist s of pre-processing the projection data for compensation of scatter, a ttenuation and the detector response prior to ramp filtered backprojec tion. Scatter is compensated for using the dual-photopeak window (DPW) method, attenuation is compensated for using Bellini's method, and co mpensation for the nonstationary detector response and noise suppressi on is performed with a frequency distance principle (FDP) Wiener filte r. This approach was compared to a number of different processing meth ods using a Monte Carlo simulation study of an anthropomorphic digitiz ed phantom of the liver and spleen. The DPW/FDP Wiener filtering metho d was shown to provide accurate quantitation of the liver as well as a n increase in the ratio of tumor contrast to background noise as compa red to Butterworth smoothing.